On a syphon type, the diaphragm will scream if perforated or cracked. Depending on which system you have fitted, this could be anything from the ball valve to the flap valve and all points between.
Below are instructions to change something completely. If you recognise what system the contributor is referring to all is well. For the rest of us it makes little sense.
Explanation of a repair to an unspecified flush system
I don't know why but follow these instructions EXACTLY to fix it.
Turn off the water supply to the toilet. Follow the hose attached to the bottom of the toilet tank to the cut-off valve. Turn this valve clockwise to turn off the water. Empty the tank by flushing the toilet, then dry out the toilet tank using old towels or a sponge. Place a bucket under the toilet tank to catch any water that is still in the tank.
Unscrew the nut holding the hose to the bottom of the tank with vice grips or channel locks.
Remove the nut screwed on to the toilet pump. This is under the toilet tank. After you loosen this nut, you may need to hold the toilet pump with one hand while removing the nut with the other because the toilet pump may turn with the nut.
Remove the clip attached to the refill tube from the overflow pipe. Remove the toilet pump from the toilet tank.
Attach the refill tube that came with your replacement toilet pump to the new toilet pump. Slide one end of the refill tube over the nipple on the toilet pump to cover the nipple completely. Attach the angle adapter to the other end of the refill tube.
Place one of the shank washers that came with your replacement toilet pump on the threaded shank of the new toilet pump. Place the threaded shank into the hole in the bottom of the toilet tank.
Fit the other shank washer over the threaded shank and push the washer firmly against the toilet tank.
Replace the nut on the threaded shank of the toilet pump and tighten fully.
Clip the refill tube to the overflow pipe using the angle attachment provided.
Screw the water supply hose tightly onto the threaded shank. Turn the water supply back on and check for leaks. If water leaks from around the new toilet pump, check to make sure both shank washers are firmly in place and tighten both nuts fully.
Your toilet may gurgle when flushed due to a blockage in the plumbing system, such as a clog in the pipes or a venting issue. This can cause air to be trapped in the pipes, leading to the gurgling sound when the toilet is flushed. It is important to address this issue promptly to prevent further plumbing problems.
When the toilet is flushed, it can create a sudden change in water pressure in the plumbing system. This change in pressure can cause air to be sucked into the pipes, leading to the gurgling sound in the shower drain.
When the toilet is flushed, it creates a sudden change in pressure in the plumbing system. This change in pressure can cause air to be sucked into the drain pipes, leading to the gurgling sound in the tub as the air escapes.
The toilet whines when flushed due to a possible issue with the fill valve or the flapper valve. This can cause vibrations and noise as water flows through the system. It is recommended to check and possibly replace these parts to resolve the whining sound.
The toilet may make a flushing sound when it hasn't been flushed due to a leak in the tank or a faulty flapper valve, causing water to flow into the bowl and create the sound.
A possible cause of the high-pitched sound from your toilet could be a faulty fill valve or a worn-out ballcock assembly. It is recommended to have a plumber inspect and repair the issue to prevent further damage.
Your toilet may be gurgling when flushed due to a clog in the drain pipe, a blocked vent pipe, or a malfunctioning fill valve. This can cause air to be trapped in the pipes, leading to the gurgling sound. It is recommended to have a plumber inspect and fix the issue to prevent further problems.
A toilet might make a burping sound when flushing due to air that was trapped in the pipe. Sometimes giving the toilet a quick plunge will prevent this.
A high-pitched sound coming from your toilet could be caused by a faulty fill valve, a worn-out flapper, or water pressure issues. It is recommended to have a plumber inspect and repair the toilet to resolve the issue.
A high-pitched sound coming from your toilet could be due to a faulty fill valve or a worn-out ballcock assembly. These parts may need to be replaced to fix the issue and stop the noise.
When the toilet is flushed, it creates a sudden rush of water down the drain pipes. This rush of water can create a vacuum effect in the plumbing system, causing air to be sucked in through the bathtub drain. This air passing through the water in the bathtub can create a gurgling sound.
I had the same issue with my Cherokee Sport 4.0 until I had the heater core flushed. After a couple trips once flushed, high pitched sound discipated.